Audio Database

The

DENON PMA-1500R
68,000yen(around the 1998 time)

Description
 
The Integrated Amplifier which inherited the technology of S series and carries UHC-MOS.

In order to solve the opposite problem of delicate power of expression and a speaker drive, "large current type magnification element UHC-MOS" which also has the 3 to 10 times [ usual ] as many current supply capability of peak current 120A in an output stage is adopted.
UHC-MOS is an element which current supply capability is improved a bipolar transistor and more than equivalent, and also has a sound quality merit of MOS-FET, and the variation in magnification operation is canceled by carrying with single push pull composition.

L. C (Leakage Canceling) mount twin transformer is adopted.
The twin transformer parallel connection which improves sharply the characteristic of each magnetic circuit and winding wire circuit developed by monophonic power amplifier POA-S1 of DENON is adopted. Moreover, by considering influence of magnetic etc. as the L.C mount canceled mutually, the leakage flux of the power transformer used as the noise source in amplifier was reduced, and high current supply capability and low-noise-ization are realized.

The technology developed by Integrated-Amplifier PMA-S1 of DENON is adopted as a rectifier circuit.
While using the large-sized high-speed rectification diode (first recovery diode) excellent in large current supply capacity and aiming at correspondence to a high speed and large current, the high-quality sound capacitor is used for a power source capacitor.

In order to cancel degradation of the sound quality by the mutual intervention between circuits, or inflow of a noise, it had composition which made the power amplifier block become independent, and also the block structure which also separated the circuit where other signal levels differ is adopted. This has eliminated the influence on the sound quality by the interference during each block.
Moreover, since a chassis examines and uses the thickness of a copper plate in order to secure high rigidity, and also the right comb of vibration is put into practice, a transformer base and special rubber have been added to the power transformer part.

gilding processing is performed for carrying out brass shaving appearance, and more reliable connection is enabled in the speaker terminal.
Moreover, two terminals are carried and bi-wiring is supported.

The pre-out terminal is carried.

The first rank circuit of discrete composition of having used low-noise FET is adopted as a phone equalizer part.
Moreover, both of the cartridges of MM/MC can be used by the change of a switch.

A gilding terminal, carbon resistance, a capacitor, etc. are using the reliable part.
Moreover, in order to lower power-source impedance, the inlet type very-thick power cord is adopted.

System remote control is attached and CD, the cassette deck, and the tuner are also supported.
Moreover, circuit power sources for control, such as remote control, equip the independent power transformer, and are considering it as the composition which makes interference to an audio circuit the minimum.

Two kinds of variations, gold and black, occurred.

Black
Rear
Internal UHC-MOS

Rating of a mode
Form Integrated Amplifier
<Power amplifier part>
Output power (both channel drive, CD->SP out) 70W+70W (8 ohms, 20Hz - 20kHz)
140W+140W (4 ohms, 1kHz)
THD 0.01% (Output-power-3dB o'clock, 8 ohms, 1kHz)
Output terminal Speaker AorB: 4ohms - 16ohms
Speaker A+B: 8ohm-16ohm
At the time of bi-wiring: 4ohms - 16ohms
<Preamplifier part>
Input sensitivity/impedance Line: 150mV/47kohm (Source Direct off)
150mV/13kohm (Source Direct on)
Phono MM: 2.5mV/47kohm
Phono MC: 0.2mV/100 ohms
Equalizer amplifier output (Rec out terminal) 150mV of rating
RIAA deflection 20Hz-20kHz±0.5dB
<Synthesis>
Signal to noise ratio
(at the time of A network and an input terminal short circuit)
Line:110dB
Phono MM: 91dB (at the time of a 5mV input)
Phono MC: 76dB (at the time of a 0.5mV input)
Tone control Bass: ±8dB (100Hz)
Treble: ±8dB (10kHz)
Loudness Bass:+10dB(50Hz)
Treble:+5dB(10kHz)
Power receptacle switched: Three lines, a total of 120W
Power supply voltage AC100V, 50Hz/60Hz
Power consumption 250W
At the time of standby: Abbreviation 5W
Dimensions (a base, a knob, a terminal included) Width 434x height 134x depth of 407mm
Weight 14.0kg
Attachment System remote control